Fourdrinier wire



Sept. 5,

0. A. ,ABENDROTH FOURDRIHIER WIRE Filed June 5, 1943 a vsdmj/mfz D.A-Ahendruih.'.

Patented Sept. 5, 1944 UNITED STATES PATENT OFFICE FoUmmmma wmE cm A. Almndroth, Menasha, Wis. Application June 5, 1943, Serial No. 489,867

4 Claims. (of. 139-425) Much difficulty is experienced in the actual use of wire belts, in that when the wires are woven, relatively sharp bends and deep valleys are formed where the wires cross. Due to the sharp bends the belt is weakened at these points and during the continuous operation of the belt over the end rollers the wires break or snap.

Also the sharp bends and valleys tend to mark the wet paper passing over the belt.

It is therefore, one of the primary objects of my invention to provide a Fourdrinier wire of a fiat nature, in which the sharp bends and deep valleys are eliminated to a great extent, whereby to prevent the strain on the wires due to the sharp bends and to prevent the marking of the paper sheet by such sharp bends and deep valleys.

Another salient object of my invention is to provide a Fourdrinier belt, in which certain parallel wires (preferably the weft wires) are provided with a soft outer metal shell or sleeve, so that the hard metal warp wires will imbed themselves inthe soft metal shell of the weft wires, thereby eliminating to a great extent, the

- sharp bends and thus provide a substantially flat belt.

A further important object of my invention is to provide a woven wire Fourdrinier belt in which the weft wires only consist of a hard metal core and an outer sleeve or shell of soft metal.

With these and other objects in view, the invention consists in the novel construction, ar-

rangement and formation of parts, which will be hereinafter more specifically described, claimed and illustrated in the accompanying drawing, in which drawing:

Figure 1 is an enlarged, fragmentary, detail, plan view of a part of a belt of a. Fourdrinier machine, a part of the view being shown broken away and in section.

Figure 2 is a detail, sectional view taken substantially on the line 22 of Figure 1 looking in the direction of the arrows, the view being on a greater scale than Figure 1.

Figure 3 is a sectional view taken at rightangles to Figure 2 and substantially on the line 3-3 of Figure 2*looking in the direction of the arrows.

Figure 4 is an enlarged, detail, sectional view through on of the weft wires before being woven in a belt. i

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter B generally indicates a fragment of a woven wire belt for a Fourdrinier machine. This belt B comprises a plurality of longitudinally extending warp wires 5 and a plurality of transverse cross or weft wires 6. These wires are woven together in accordance with standard practice.

In accordance with my invention the warp wires 5 are formed from relatively hard metal, such as steel or hard bronze.

The weft wire 6 each include a hard metal cor 1 and this core can be constructed from steel, iron, Monel or hard bronze. The hard metal core 1 is provided with an outer sleeve or shell 8 formed from relatively soft metal, such as brass or soft bronze.

Before weaving, the'warp and weft wires 5 and 6 are substantially of the same diameter and during the weaving process the tension on the wires will be such that the hard warp wires 5 will embed themselves in the soft outer sleeve or shell 8 of the weft wires 6. Due to the fact that the warp wires embed themselves in the weft wires, enlarged bights or bends will not be formed and by referring to Figures 2 and 3, it can be seen that the bends 9 of the woven wire are on a relatively large arc of a circle and consequently the belt is flattened. During the imbedding of the hard warp wires 5 in the soft outer metal shell, of the weft wires the soft metal will be displaced and the metal displaced will tend to flow around the warp wires as indicated by the reference character In. Consequently a seat II is formed for the warp wires at each bend. This prevents shifting of the warp wires transversely and the drainage opening through the belt will hold true to size.

Due to the fact the elongated bends can be formed in the wire no undue strain is placed on the wires and consequently the breaking of the .wires is reduced to a minimum. As stated, relatively flat belts are formed which will not mark the sheet.

Changes in details may be made without departin from the spirit or scope of my invention,

casing said core, said first named group of wires being adapted to imbed themselves in the soft shells of the second mentioned group of wires during the weaving of the belt.

7' 2. A belt particularly adaptable for use in Fourdrinier machines comprising hard metal warp wires, and weft wires each consisting of a hard metal core and a soft outer shell, said warp wires being adapted to imbed themselves in the soft sleeves of the weft wires during the weaving of the. belt.

3. A belt particularly adaptable for use in Fourdrinier machines comprising hard metal 

